The Berne Treaty makes it impossible.
Carlisle 14 [Stephen; the first Copyright Officer of Nova Southeastern University. He is a published author on the topic of copyright law and was a legal intern with the United States Copyright Office. He was also a two-time Chair of the Florida Bar’s Entertainment Arts and Sports Law Section; 7/15/2014; Nova Southeastern University; “Copyrights Last Too Long! (Say the Pirates): They Don’t; And Why It’s Not Changing Anytime Soon”; http://copyright.nova.edu/copyright-duration/]//kaviWaRu
So any proposal that the United States revise its length of copyright duration to anything less than the life of the author plus 50 years is a non-starter, unless there is going to be a wholesale repudiation by Congress of the Berne Treaty and the benefits of near universal protection of U.S. copyrights around the globe. Similarly, the suggestion of some that continued copyright protection be conditioned upon a physical filing and the payment of a substantial fee, would also violate our obligation under Berne to insure that copyright protection exist with “no formalities.”